XI A Science Ch-9 Force and Laws Of Motion

Force and Laws Of Motion

Topic taught-23 August 21
Introduction to Force
A force is an effort that changes the state of an object at rest or at motion. It can change an object’s direction and velocity. Force can also change the shape of an object.

To know more about Force, visit here.

Balanced and Unbalanced Forces
When balanced forces are applied to an object, there will be no net effective force acting on the object. Balanced forces do not cause a change in motion.

Unbalanced forces acting on an object change its speed and/or direction of motion. It moves in the direction of the force with the highest magnitu

Push or pull of an object is considered a force. Push and pull come from the objects interacting with one another. Terms like stretch and squeeze can also be used to denote force.
In Physics, force is defined as:

The push or pull on an object with mass that causes it to change its velocity.

Force is an external agent capable of changing the state of rest or motion of a particular body. It has a magnitude and a direction. The direction towards which the force is applied is known as the direction of the force and the application of force is the point where force is applied.

The Force can be measured using a spring balance. The SI unit of force is Newton(N).

Common symbols:F→, F
SI unit:Newton
In SI base units:kg·m/s2
Other units:dyne, poundal, pound-force, kip, kilo pond
Derivations from other quantities: F = m a
Dimension:LMT-2















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